To my surprise one of the fastest growing component being seen in system builds are hard drive racks, especially in small form factor rigs. And I am sure this has to be either the lack of space in some of these SFF cases or the difficult it takes to which drives in and out after the system has been completely built. Our friends at Vantec have sent to us over our first multi-drive 2.5 rack in the form of the MRK-425ST-BK or the F4 Quad Bay rack. The rack installed in a single 5.25 optical drive bay and can house a total of four 2.5 SATA drives allowing you to get rid the interior HDD cages and allow for better airflow in many cases."